Tottenham manager Andre Villas-Boas has said he found Luis Suarez's bite on Branislav Ivanovic in Liverpool's 2-2 draw with Chelsea at Anfield "shocking".
However, he expressed surprise at the length of the ten-game ban imposed by the FA in comparison to the eight-match suspension received by the Uruguayan for racial abuse in December 2011.
Villas-Boas said: "I think the image is shocking. You would expect a lengthy ban.
"To compare it with the ban he received for racist abuse... [that was] something that has more gravity implied, in my opinion. But the 10 games is something the FA have decided."
Wigan manager Roberto Martinez said he did not believe comparisons could be drawn between the Suarez incident and the knee-high tackle on Massadio Haidara for which Latics' Callum McManaman escaped punishment.
"It is completely different," he said. "There is a big difference between something that happens when you have behaviour that is a normal part of the game.
"You are trying to win the ball, hit it and then follow through. That is very different to having unsporting behaviour with violent conduct."
He said he believed Suarez deserved his lengthy suspension, adding: "Everyone agreed it was wrong behaviour, and he was the first one to accept it.
"We all knew it was wrong behaviour. It is not something you should see on a football pitch.
"We need to know what the FA is basing its ban on and whether they have taken into consideration his previous charges and the previous [biting] incident in Holland."
Newcastle's Alan Pardew - whose side play Liverpool at the weekend in the first game of the Suarez ban - said: "It was an incident that everybody was shocked by, even him. You have young kids playing in the park, and it is not what you want to see.
"He's a fantastic player and having a marvellous season. It is unfortunate for him, because he has been outstanding. But it may help us. "
However, West Ham boss Sam Allardyce said he felt more dangerous incidents than the bite often went unpunished and claimed a challenge by Liverpool striker Dean Sturridge in the same game had been worse.
"It is not politically correct in this country, that type of thing [the Suarez incident], so you have to accept the punishment," Allardyce said.
"I think there was a tackle in the Liverpool game where a Liverpool player should have been sent off - that was more dangerous. Sturridge's over-the-top tackle was a leg-breaker, and he managed to get away with that."
He said Suarez would have to "take it on the chin and move on" but warned the striker he needed to "stop that little fuse that keeps blowing in his head".